Effect of HDI/IPDI mole ratio on properties of waterborne polyurethane and its film

被引：0
|
作者：
Yan, Caibin [1 ]
Fu, Heqing [1 ]
Chen, Huanqin [1 ]
机构：
[1] School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong
来源：
Huagong Xuebao/CIESC Journal | 2012年 / 63卷 / 07期
关键词：
Adhesive property; Crystallinity; Mechanical property; Waterborne polyurethane;
D O I：
10.3969/j.issn.0438-1157.2012.07.039
中图分类号：
学科分类号：
摘要：
A series of waterborne polyurethanes (WPUs) with 50% solid content were prepared through a prepolymer process. The properties of the dispersion and its film were characterized by Fourier transform infrared spectroscopy (FT-IR), particle size analyzer, X-ray diffraction (XRD), differential scanning calorimetry (DSC)and tensile test machine. The influence of HDI/IPDI mole ratio on the properties of waterborne polyurethane dispersion, its film and the adhesive strength to EVA/PVC substrate were studied. The relationship between adhesive strength and time was analyzed. The results indicated that the WPU dispersion, crystallinities of soft segment and hard segment were improved with increasing HDI/IPDI mole ratio, while tensile strength of films significantly increased and then showed a small decrease, and the elongation at break increased first, then decreased. WPU films exhibited excellent waterproof performance, and the amount of water absorption was as low as 5.0%(mass). The test result showed that all WPUs prepared exhibited outstanding adhesive strength to EVA/PVC substrate, and the joint failure of EVA/PVC substrates was all caused by the failure of interface after 24 h. With increasing mole ratio of HDI/IPDI, the adhesive strength of adhesive to EVA/PVC substrate increased, and when the mole ratio of HDI/IPDI was 7:1, the performance of WPU adhesive was the best. © 2012 All Rights Reserved.
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页码：2258 / 2265
页数：7
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